package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring管理，需要自己new，不能注入其他对象
    //我们可以通过构造传参，进行手动注入
    public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //一行一行读取execl中的数据
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        //判断excel中有无数据
        if (subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }
        //一行一行读取的，每次都有两个值，第一个值是一级分类，第二个值是二级分类
        //先判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(subjectService, subjectData.getOneSujectName());
        if (existOneSubject == null) { //没有相同一级分类，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSujectName()); //一级分类名称
            subjectService.save(existOneSubject);
        }
        //判断二级分类是否重复
        String pId = existOneSubject.getId(); //获取一级分类的id值
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, subjectData.getOneSujectName(), pId);
        if (existTwoSubject == null) { //没有相同一级分类，进行添加
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pId);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName()); //二级分类名称
            subjectService.save(existTwoSubject);
        }
    }

    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", 0);
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pId) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pId);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
